Their assignment was to recruit young Cubans to anti-government activism, which they did under the guise of civic programs, including an HIV prevention workshop. … Over at least two years, the U.S. Agency for International Development — best known for overseeing billions of dollars in U.S. humanitarian aid — sent nearly a dozen neophytes from Venezuela, Costa Rica and Peru to gin up opposition in Cuba. The danger was apparent to USAID, if not to the young operatives: A USAID contractor, American Alan Gross, had just been hauled away to a Cuban jail for smuggling in sensitive technology.